2011/4/1 Charles Hixson <charleshixsn at earthlink.net>:
> [...]
> I'm trying to determine whether the last non-whitespace character of a
> string is a colon, and I haven't been able to figure out the best way of
> doing this. In python I'd just trim the string and look at the character
> before the end,
> [...]
Hello,
well, you can do the same in Racket — just searching for "trim" in the
documentation would have shown you where to find the necessary
functions:
#lang racket/base
(require
srfi/13)
(provide
(all-defined-out))
(define (ends-with-colon? str)
(string-suffix? ":" (string-trim-right str)))
You could also use a regular expression:
#lang racket/base
(provide
(all-defined-out))
(define (ends-with-colon? str)
(regexp-match? #px":\\s*$" str))
By the way, this solution would probably be the more efficient in
Python, as well:
import re
def ends_with_colon(str):
return re.search(':\s*$', str) <> None
I hope that helps :-)
Ciao,
Thomas
--
When C++ is your hammer, every problem looks like your thumb.